JPS61272701A - Solar concentrator - Google Patents

Abstract

PURPOSE:To concentrate solar light surely to a small photodetecting part over a long period by arranging the 1st and 2nd condenserslens so that the arc-like arrangement is directed to the east-west direction. CONSTITUTION:The plural 1st condenserlenses 1 constituting a linear Fresnel lens to be acted as a cylindrical condenser are arranged like a circular arc so that the focal lines L of light rays made incident in respective optical axis directions are radically intersected on almost the same plane with successively different angles. The 2nd condenserlenses 2 are arranged like a circular arc concentrical to the arc-like arrangement of the 1st condenserlenses with succes sively different angles in the direction rectangular to respective 1st condens erlenses 1. Since the array direction of the 1st and 2nd condenserlenses 1, 2 is directed in the east-west direction, solar light can be concentrated into a narrow range over a long period without using a specific tracking device.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a solar light concentrating device for concentrating sunlight.

(Problems to be solved by the prior art and the invention) For example, when concentrating sunlight to illuminate a dark room or the north side where there is no sunlight, conventionally a parabolic reflector or a single-layer convex lens was used for the condensing part. Then, the concentrated light was introduced through an optical fiber cable and diffused again to illuminate the dark place, but with either method, an independent tracking device was required because the position of the sun changed over time. .

In addition, parabolic reflectors and convex lenses use a single optical system to focus light rays into a point shape, so they must be highly accurate, and their position and orientation relative to the sun's rays and focal point must be carefully determined. However, delicate precision was required, and the entire device became complex.

The present invention is capable of effectively concentrating sunlight for a long period of time without the need for a special tracking device, and the lens used can be a relatively simple lens that does not require high precision, and the entire device can be easily constructed. This is what I did.

(Means for Solving the Problem) The technical means of the present invention for solving this technical problem is such that a plurality of first condensing lenses 1 that condense light rays in a linear manner are arranged so that each fish vAL is approximately A plurality of lenses are arranged in an arc shape so as to change radially at different angles on the same plane, and converge light rays into a line between each of the first condensing lenses 1 and its focal line position. The second m-th optical lens 2 is the first condensing lens l
The light rays passing through the first condenser lens 1 are converged to approximately one point, and are arranged in an arc concentric with the arrangement of the first condenser lens 1 at different angles.

(Function) If the first condensing lens 1 and the second condensing lens 2 are arranged in an arc shape so that they face east and west, the condensing lens can be focused without the need for a special tracking device. The second condensing lens 2
Even though the number changes one by one from east to west, sunlight can be reliably focused on the small light receiving part 6 for a long time.

(Example) Hereinafter, the present invention will be explained according to the illustrated example.
In Figures 1 and 2, 1 is the first condenser that condenses the light rays into a line.
The condenser lens 1 is made of a cylindrical condenser lens made of a transparent and heat-resistant synthetic resin such as a thermofusible material such as polymethyl methacrylate or polycarbonate, and a thermosetting material such as diethylene glycol bisallyl carbonate. It functions as a near Fresnel lens, and as shown in FIGS. 3 to 5, it condenses incident sunlight into a line to form a focal line.

A plurality of first condensing lenses l (five in the illustrated example) are provided, and each of these first condensing lenses l has approximately the focal line of a ray incident in the optical axis direction, as shown in FIG. They are arranged in an arc shape so that they intersect radially at different angles within the same plane.

2 is the second one that focuses the light beam into a line! The cylindrical lens is a l-light lens and is made of a transparent and heat-resistant synthetic resin such as polymethyl methacrylate, polycarbonate, diethylene glycol bisallyl carbonate, etc. Forty-five second condenser lenses 2 are provided between the first condenser lens 1 and its focal line position. These second condensing lenses 2 are arranged in a direction perpendicular to each of the first condensing lenses l so as to condense the light beams that have passed through the first condensing lenses 1 to approximately one point, and each of the second condensing lenses 2 is the first
They are arranged in a circular arc concentric with the circular arc arrangement of the condenser lens 1 at different angles. That is, the sunlight that enters the first condenser lens 1 in the direction of its front axis is reflected by the first condenser lens 1 as shown in FIGS. 2 and 6.
A large number of second condensing lenses 2 are arranged side by side on a circular arc 3 with a radius r centered on the focal point F, which converges at approximately one point after passing through the second condensing lens 2, and a circular arc 4 with a radius R larger than that. A plurality of first condenser lenses 1 are arranged above. The angle β at which the second condensing lenses 2 are arranged is in the range of 90 degrees, and the angle α between adjacent second condensing lenses 2 is 2 degrees as shown in FIG.

5 is an optical fiber, the light receiving part 6 of which is connected to the first condenser lens 1
A focal point F is provided at which light incident in the optical axis direction is focused through the second condensing lens 2.

According to the configuration of the above embodiment, the first condenser lens l and the second condenser lens
When the condenser lenses 2 are arranged so that the direction in which they are arranged in an arc shape faces east and west, the first condenser lens 1 has refractive power in only one direction, that is, the north-south direction. Sunlight incident in this direction is condensed into a line on a plane perpendicular to the north-south direction. As the direction of incidence of the sun's rays changes due to the sun's diurnal movement, the first condensing lens 1 in which the sun's rays are in the optical axis direction changes sequentially from the east to the west first condensing lens 1. 1. The focal lines of sunlight that are incident on the condensing lens l at angles similar to the optical axis direction vary sequentially, but as shown in Figure 3, the positions of these focal lines are always within range A. exist.

On the other hand, there are 45 second condensing lenses 2 within a 90 degree angle range, and the time it takes for the sun to move through a 90 degree angle in the east-west direction is 6.
Since it is time, 360 minutes + 45 pieces = 8 minutes/piece, that is, every 8 minutes, the sun's rays approximately reach the second point in the optical axis direction.
The number of condensing lenses 2 is changed from east to west, 11 at a time, and at a certain point, as shown in FIG. In the case of one loss in the axial direction, the sunlight passing through the second condensing lens 2a is condensed at the center of the light receiving section 6 as shown in FIG. 8a and a'. Four minutes later, the sunlight changes by one degree, and as shown in FIG. The light is focused on the outer periphery of the portion 6, respectively. After another 4 minutes, the sunlight changes by 1 degree and becomes in the optical axis direction with respect to the second condenser lens 2b, and the sunlight that has passed through the second condenser lens 2b as shown in FIG. The light is focused on the center of the light receiving section 6. Thereafter, the second condensing lens 2 that focuses the sunlight on the light receiving section 6 is changed one by one from east to west every 8 minutes in the same way, and the light receiving section 6 is Even if it is extremely small, sunlight can be reliably focused on the light receiving section 6 for 6 hours.

In Figure 9, the angle α formed by the adjacent second condensing lenses 2 is 1.9.
5 degrees, and the diameter of the light receiving part 6 is 10 degrees, and 12 degrees.
It shows actual measurement results taken every few minutes from 9:00 p.m. According to the actual measurement results, it can be seen that between 12:09 and 12:49, the seven second condensing lenses 2 sequentially condense sunlight onto the light receiving section 6 without interruption.

Note that the first condensing lens 1 and the second condensing lens 2 may each be formed separately, and then a plurality of them may be arranged in an arc shape and connected and fixed to each other. A plurality of first condensing lenses 1 and a plurality of second condensing lenses 2 may be arranged in an arc and integrally molded.

(Effects of the Invention) According to the present invention, by arranging the first condensing lens l and the second condensing lens 2 so that the direction in which they are lined up faces east and west, there is no need for a special tracking device, and sunlight rays can be focused in a narrow range over a long period of time. Moreover, the first
The condenser lens 1 and the second condenser lens 2 simply condense light into a line, and a cylindrical condenser lens that does not require high precision like a convex lens can be used. 1.2 The position and orientation of the device do not require much precision, and therefore the overall structure of the device can be simplified, and the device can be easily manufactured and provided at low cost, and its effects are significant.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall perspective view;
Figure 2 is a side view, Figure 3 is a side view of the first condenser lens, Figure 4 is a perspective view of the first condenser lens, Figure 5 is a front view of the first condenser lens, and Figure 6 is a side view of the first condenser lens. FIG. 7 is an enlarged perspective view of the second condensing lens portion, FIG. 7 is an enlarged side view of the second condensing lens, FIG. 8 is a side view and plan view for explaining the operation, and FIG. 9 is a diagram showing actual measurement results. . 1--first condensing lens, 2--second condensing lens, L--focal line.

Claims (1)

[Claims] 1. A plurality of first condensing lenses 1 that condense light rays into a line,
They are arranged in an arc shape so that their respective focal lines L change radially at different angles on substantially the same plane, and between each of the first condensing lenses 1 and the focal line position, A plurality of second condensing lenses 2 converge the light beams that have passed through the first condensing lens 1 into approximately one point, and each has an arc shape concentric with the arrangement of the first condensing lens 1. A solar light condensing device characterized in that the solar light condensing device is arranged so as to be arranged sequentially at different angles.